using herbicide classification chart
TRANSCRIPT
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Using The Herbicide Classification Chart
Travis LegleiterWeed Science Program Specialist
Purdue University
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• Classification Chart is a redesign of former Herbicide MOA chart
• Part of the “Take Action” effort• Access to chart and other
resources:http://
takeactiononweeds.com/
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What Causes Herbicide Resistance?
• Selection Pressure– The repetitive use of a single mode of action
over time under non-ideal conditions.
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Mode of Action vs. Site of Action
• Terms often interchanged or confused• Mode of Action: The effect of the herbicide on
plant growth and eventual death at effective doses.
• Site of Action: The enzyme site or pathway that the herbicide binds or inhibits to create the plant growth effects.
• Sites of action are subsets of modes of action
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Some Modes of Action have one site of action
Other Modes of Action have multiple sites of action
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Site of Action Group #’s• Each unique site of action given a unique
number • Group #’s are easier to use and recognize than
scientific site of action names• These group #’s are included on many
herbicide labels as well.
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Publication is split down the middle into two Charts:Chart Layout:
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By Mode of Action: Trade name products and their respective active ingredients
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By Mode of Action: Trade name products and their respective active ingredientsGrouped ByChemical Family
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By Mode of Action: Trade name products and their respective active ingredientsGrouped ByChemical FamilyGrouped BySite of Action
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By Mode of Action: Trade name products and their respective active ingredientsGrouped ByChemical FamilyGrouped BySite of ActionGrouped ByMode of Action
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By Mode of Action: Trade name products and their respective active ingredientsGrouped ByChemical FamilyGrouped BySite of ActionGrouped ByMode of Action
Chart includes: Number of resistant weed species for each site of action
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By Mode of Action: Trade name products and their respective active ingredientsGrouped ByChemical FamilyGrouped BySite of ActionGrouped ByMode of Action
Chart includes: Number of resistant weed species for each site of action
And Most ImportantlyGroup Number and an associated color for each Site of Action
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Example: Callisto
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Example: CallistoActive Ingredient: mesotrione
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Example: CallistoActive Ingredient: mesotrioneChemical Family: Triketone
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Example: CallistoActive Ingredient: mesotrioneChemical Family: TriketoneSite of Action: HPPD Inhibitor
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Example: CallistoActive Ingredient: mesotrioneChemical Family: TriketoneSite of Action: HPPD InhibitorMode of Action: Pigment Inhibitor
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Example: CallistoActive Ingredient: mesotrioneChemical Family: TriketoneSite of Action: HPPD InhibitorMode of Action: Pigment InhibitorNumber of Resistant Weed Species: 2
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Example: CallistoActive Ingredient: mesotrioneChemical Family: TriketoneSite of Action: HPPD InhibitorMode of Action: Pigment InhibitorNumber of Resistant Weed Species: 2& Finally
Herbicide Group #: 27
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By Premix:
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By Premix: Premix names listed in alphabetical order
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By Premix: Premixes listed in Alphabetical order
Includes:-Active ingredients
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By Premix: Premixes listed in Alphabetical order
Includes:-Active ingredients-Trade names of products w/ single active
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By Premix: Premixes listed in Alphabetical order
Includes:-Active ingredients-Trade names of products w/ single active-Site of Action Group Numbers and corresponding color coding.
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By Premix: Premixes listed in Alphabetical order
Includes:-Active ingredients-Trade names of products w/ single active-Site of Action Group Numbers and corresponding color coding.
Example:Lexar EZ contains actives:-mesotione (Callisto), s-metolachlor(Dual II Magnum), & atrazine(Aatrex)
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By Premix: Premixes listed in Alphabetical order
Includes:-Active ingredients-Trade names of products w/ single active-Site of Action Group Numbers and corresponding color coding.
Example:Lexar EZ contains actives:-mesotione (Callisto), s-metolachlor(Dual II Magnum), & atrazine(Aatrex)
Those actives are in the site of action groups:-27, 15, & 5
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By Premix: Premixes listed in Alphabetical order
Includes:-Active ingredients-Trade names of products w/ single active-Site of Action Group Numbers and corresponding color coding.
Example:Lexar EZ contains actives:-mesotione (Callisto), s-metolachlor(Dual II Magnum), & atrazine(Aatrex)
Those actives are in the site of action Groups:-27, 15, & 5
Remember Callisto from the “By Mode of Action” Chart. You can link to that chart using the color coding (Blue) and group number (27).
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Outline Herbicide Programs
• Use chart to outline site of action rotation
• Find products on chart and write down site of action group #
• What to look for:-# of site of action used-# of effective sites of action used-Selection pressure placed on a
site of action (used more than 2x)
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Herbicide ClassificationWaterhemp (ALS + glyphosate resistant)
Timing Herbicide Active Ingredient(s)SOA
Group
Early Post Extreme
Late Post Flexstar GT
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Herbicide ClassificationWaterhemp (ALS + glyphosate resistant)
Timing Herbicide Active Ingredient(s)SOA
Group
Early Post Extremeimazethapyr 2glyphosate 9
Late Post Flexstar GT
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Herbicide ClassificationWaterhemp (ALS + glyphosate resistant)
Timing Herbicide Active Ingredient(s)SOA
Group
Early Post Extremeimazethapyr 2glyphosate 9
Late Post Flexstar GTfomesafen 14glyphosate 9
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Herbicide ClassificationWaterhemp (ALS + glyphosate resistant)
Timing Herbicide Active Ingredient(s)SOA
Group
Early Post Extremeimazethapyr 2glyphosate 9
Late Post Flexstar GTfomesafen 14glyphosate 9
Effective Sites of Action!
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Herbicide ClassificationPalmer Amaranth (ALS + glyphosate resistant)
TimingHerbicide Active Ingredient(s)
SOA Group
Burndown
Roundup2,4-D
Envive
Early Post Prefix
Late Post Cobra
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Herbicide ClassificationPalmer Amaranth (ALS + glyphosate resistant)
TimingHerbicide Active Ingredient(s)
SOA Group
Burndown
Roundup glyphosate 92,4-D
Envive
Early Post Prefix
Late Post Cobra
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Herbicide ClassificationPalmer Amaranth (ALS + glyphosate resistant)
TimingHerbicide Active Ingredient(s)
SOA Group
Burndown
Roundup glyphosate 92,4-D 2,4-D 4
Envive
Early Post Prefix
Late Post Cobra
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Herbicide ClassificationPalmer Amaranth (ALS + glyphosate resistant)
TimingHerbicide Active Ingredient(s)
SOA Group
Burndown
Roundup glyphosate 92,4-D 2,4-D 4
Envivechlorimuron 2thifensulfuron 2flumioxazin 14
Early Post Prefix
Late Post Cobra
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Herbicide ClassificationPalmer Amaranth (ALS + glyphosate resistant)
TimingHerbicide Active Ingredient(s)
SOA Group
Burndown
Roundup glyphosate 92,4-D 2,4-D 4
Envivechlorimuron 2thifensulfuron 2flumioxazin 14
Early Post Prefixs-metolachlor 15fomesafen 14
Late Post Cobra
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Herbicide ClassificationPalmer Amaranth (ALS + glyphosate resistant)
TimingHerbicide Active Ingredient(s)
SOA Group
Burndown
Roundup glyphosate 92,4-D 2,4-D 4
Envivechlorimuron 2thifensulfuron 2flumioxazin 14
Early Post Prefixs-metolachlor 15fomesafen 14
Late Post Cobra lactofen 14
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Herbicide ClassificationPalmer Amaranth (ALS + glyphosate resistant)
TimingHerbicide Active Ingredient(s)
SOA Group
Burndown
Roundup glyphosate 92,4-D 2,4-D 4
Envivechlorimuron 2thifensulfuron 2flumioxazin 14
Early Post Prefixs-metolachlor 15fomesafen 14
Late Post Cobra lactofen 14
Effective Sites of Action!
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Your Turn!
-Write out your soybean program and site of action group numbers
-How many Effective Sites of Action do you have?
-Write out your programs for a 2 year corn and soybean rotation
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Tools For The Battle Against Weeds
https://ag.purdue.edu/btny/weedscience http://www.facebook.com/purdue.weedscience
Purdue Weed Science Webpage: Purdue Weed Science Facebook:
Travis Legleiter: [email protected](765) 496-2121
Dr. Bill Johnson [email protected](765) 494-4656